\relax 
\citation{Luedtke2008}
\citation{Luedtke2008a}
\citation{Luedtke2010}
\citation{Luedtke2008a}
\citation{Luedtke2008}
\citation{Luedtke2008a}
\citation{Luedtke2010}
\citation{Luedtke2010}
\citation{Luedtke2008}
\citation{Luedtke2008a}
\bibdata{proposal}
\bibcite{Luedtke2010}{1}
\bibcite{Luedtke2008}{2}
\bibcite{Luedtke2008a}{3}
\bibstyle{plain}
